Optical testing and measuring instrument



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ATTORNEYS.

Apr. 10, 1923.

' Apr. 10, 1923.

J. MIHALYI OPTICAL TESTING AND MEASURING INSTRUMENT Filed May 11 1920 5 sheets-sheet 2 IN VEN TOR A TTORNEYS.

Apr. 10, 1923.

J. MIHALYI OPTICAL TESTING AND MEASURING INSTRUMENT Filed May 11, 1920 INVEN TOR 5 Y l 07/7 1 E 5 744 BY W ATTORNEYS.

J; MIHALYI Apr. 10, 1923 A TTORNEYS.

Apr. 10, 1923.

J. MlHALYl OPTICAL TESTING AND MEASURING INSTRUMENT 5 sheets-sheet 5 Filed May 11, 1920 Patented Apr. 10, 1923.."

JOSEPH MIHALYI, or wasmneron, ms'rmoror'ooLum nm; I

or'rIcAr, TESTING AND mnasunmenvs'i nu linnrv To, all whom it may concern:

Be it known that I, Josarn MIHALYI,.8. citizen of the United States, and resident Application fl1ed May 11,"1920. Serial 0 5 stock;

of Washington, in the District of Columbia,\. testing the thickness. of a piecef'of' round have invented certain new and useful Improvements in Optical T esting and Measurmg Instruments, of which the following is a specification. The present invention relates to anoptical testing and measuring.instriunent, and

. an object thereof is to provide instruments for use by manufacturing concerns,- machinists, tool makers and others, so that by simple optical means an object can be tested or measured to determine whether or not it -isaccurately made.

To this and other ends the invention con sists of certain parts and-combinations of parts, all of which will be hereinafter described, the novel features being pointed out in the appended claims.

. In the drawings? Fig. 1 is a view partially in section showing an instrument constructed in accordance with the present invention;

Fig. 2 is a sideview of the instrument;

Fig. 3 is a detail view of a number of extension rodsused in connection with the instrument;

Fig. 4; is a chuck;

Fig. 5 is an end view of the chuck;

Fig. 6 shows diagrammatically the optical parts of the instrument;

partial sectional view of the Fig. 7 is a side view partially in section.

of another embodiment of the invention;

Fig. 8 shows the use of the instrument for measuring the thickness of a piece of round stock from one side;

Fig. 9 shows the adjustment of the instrument for measuring the diameter of a piece of round stock from one end;

Fig. 10 is a view showing. the manner of measuring the thickness of a piece of fiat stock from one side; A

. Fig. 11 is a view showing the manner of measuring the thickness of a piece of fla stock from one end; Fig. 12 is a view showing .the manner of measuring the distance between two openings in a piece of material;

Fig. 13 is a view of the manner of measuring the diameter of an opening in a piece of material;

Fig. 14 shows the'instrument adjusted for stock;'-- v Fig. 16 shows the instrument adusted for measuring the depth of a hole "1n the end ofa rodja'nd'i' Fig. 17 shows another manner in which thedhole in-the end of arod may be measure testing the thickness of a piece: of round 115 shows the-instrument adjusted for a According to, this invention, an optical instrument'is provided which has two View openings, the optical axes of which are arranged to intersect atthe focal point of the instrument to form two equal angles on each side of the focal point, these angles being such that a base lineconnecting the two sides of either angle at any distance from the focal point of the instrument and at right angles to the perpendicular of the triangle thus formed will have a length equal-to such perpendicular. The object is situated at such a distance from the view openings that the part thereof to be measured or tested will equal in length the base line or the perpendicular of a triangle the sides of which are formed by the optical axes of the two view openings and, in this position, the collector will bring into coincidence a certain point present in both images. Should such point not be in coincidence,

then the object is inaccurate and the amount of the relative movement betweenthe instrument and the object necessary to bring this point in coincidence determines this inaccuracy.

In the embodiment of the invention illusright angles to the perpen icular 5.will

have a length equal to the perpendicular of the triangle thus formed. In this embodiment at each view opening, a five sided or pentap'rism 6 is rigidly mounted to collect the image and to direct it to a collecting means preferably in the form of two trapeze prisms 7 which bring into coincidence two images of a point located at the focal point of the instrument. Associated with the the trapeze prisms 7 which allow bothimages received from the penta-prisms to be projected by the objective lens to the focal plane of such lens with both images appearing next to each other.

' The telescope construction in this form comprises the main or outside tube 12 "externally threaded and engaging at its lower end the chambered base 1. The lower end of'this tube is also threadedinternally to receive the mount 13, the objective being held in the mountby a retaining ring 14. At; its upper end the outside tube 12 is bored to produce a smooth fit for a focusing sleeve 15 which is provided with a spiral slot in the usual manner to receive a socket screw 16 'atthe top of the outside tube, 12. The

{rotation of the focusing. SlE-QVGU) will produce amovement which is used for focusing the image. On the focusing sleeve 15 a flange 17 is formed which acts as a stop for cooperating with the upper end of the outside tube .12 to limit the inward movement of the focusing sleeve 15. A focusing ring 18 is mounted on the focusing sleeve 15 and depends about the outside tube 12 and above the focusing ring an eye guard 19 has screw threaded engagement with the focusing sleeve and serves to hold the eye lens 11 to the upper end of the focusing sleeve. The diaphragm 20 is formed within the focusing sleeve 15 and in this instance is in the form of an internal annular flange, said diaphragm being placed directly in the focal plane of the eye piece combination and giving a circular form to the ocular field. A tubular part 20 rests against the diaphragm 9 and serves to supportv at its upper end, the collective lens 10, such lens being held in place by a second sleeve 22 which fOWDS a support at its upper end for the ocular lens 11.

It is preferred to employ in connection with the instrument a measuring-means to be used for determining the amount of inaccuracy in a piece of work. This measuring means is preferably adjustable in the direction 'of the perpendicular of the triangle and in this instance comprises a hub 23 having a screw threaded connection with the under side of the chambered base -1. The

hub has a spindle 24 threaded therein and 'eter has a one-inch adjustment.

which a knurled sleeve 27 is held b a lock "te'nsion preferably is hardened and ground perfectly flat on its extreme lower end so that the instrument may be supported from.-

this ground surface. The pitch of the spindle screw graduations, etc., may be constructed so as to obtain any reading desired, such as one one-thousandth of an inch reading, as in any micrometer.

- Adapted to be combined with the measuring means of the instrument are a number of measuring extensions 30 each of which is in the form of a short rod of circular cross section having its opposite ends perfectly fiat. one end. being adapted to cooperate with the flat surface on the ex tension 29 while the other end is adapted for cooperation .with the object to be measured. To hold the extension. rods 30 to the extension 29 a' chuck may be provided preferably in the form of a sleeve 31 having a split 32 at one end and adapted -is tapered exteriorly while at the same time being provided with screw threads 35 above the tapered portion. A nut or collar 36 turns on the screw portion 35 and has an internal taper 37 adapted to cooperate with the external taper on the sleeve for the purpose of forcing the sleeve firmly against the extension rod 30 received within the sleeve. Extension rods 30 are, in this instance, of one to five inches in length and the microm- This embodiment is. designed for any reading between zero and six inches. For reading between'five and six inchesthe instrument is used without "any extension 30; between;

four and five inches the one inch extension rod is secured to the spindle extension 29; for readings between three and four inches the two inch extension rod is used; for

The other end of this sleeve readings between two and three inches the three inch extension rod is used; for readings between one and two inches the four inch extension rod is used, and for readings between one inch and zero the live inch extension rod is used. lVhen the live inch extension rod is in place and the micrometer sleeve is at its zero point, the bottom surface or free end of the extension rod will lie at the focal point of the instrument or the crossing of the optical axes of the two view openings.

In the embodiment of the invention shown in Fig. 7, the measurement is made in the angle beyond the focal point 4. The prisms 6 at the view openings 2 are 90 degrees so that an axial ray entering the prisms will be directed to the trapeze prisms instrument when the measuring device is' is rested, upon a flat at :zero. The extensions such'as shownin Fig. 3-together with the, clamp shown in Fig. 5 may be used in connection with the.

measuring device so as to throw the bearing. intat any desired distance from the toes. point 4. The use of this form of'the; inventlon is the same as that shown in Fig. 1 except that the. base aof the triangle formed by the optical rays 3 lies beyond the focal point 4 and the effective portion of the perpendicular 5 liesalso beyond such focal point. j I

In Figs. 8 to 15 inclusive there has been illustrated a number of different methods of using this embodiment of the instrument- In Fig.. Stile-instrument is shown as adjusted for measuring apiece of round stock which is assumed to be six inches in diam-' eter. The lower end of the extension'29 is brought in engagement With"one. -side of the stock while the opposite side of the stock. iece of material 02 with a line 417 marke thereon. The micrometer sleeve 27 is rotated so that the zero int thereon coincides with the index 27. n this'position theline a should be visible in the instrument as a single-line as shown in the circle Y, Fig. 8. If the stock is not exactly six inches in. diameter, then 4 the line m will appear as two lines as shown in the circle Z, Fig. 8. The diameter of the round stock vmay also be measured in the manner shown in Fig. 9. By bringingthe extension 29 in engagement with the end of the stock, the micrometer is adjusted in the same manner as in Fig. 8 and if thestock is exactly sixinches, then the opposite edges of the stock will appear to coincide as in the circle Y Fig. 9, but if it is less than six inches,-then' the opposite edges will appear separated as in the circle Z, or if. greater there will be an overlapping of the images. 9 v

In Figs. 10 and 11, the instrument is shown as being employed for measuring the thickness of a piece offlat stock. In this: illustration, the longest extension rod 30. is employed, being secured by the clamping device to'the screw extension 29. Themicrometer sleeve 27 is adjusted to correspond to the desired thickness of j the 'material. The stock a: is placed upon aplate m with. the etched line as and if the stock be of the desired thickness, 'the etched line will? appear as one line in the circle Y Fig. 10. and if it be too thin it will appear as two lines as in the circle Z Fig. 10. In Fig. 11 the lower end of the extension rod 30 is brought into engagement with the end of the stock'w and the instrument is adjusted 'as in Fig. 10. If the stock be of theproper.

thickness the two ima es will have their i Fig'll, whereas, if the material be too thin the two images will appear separated as in the circle a Fig. 11. I y

.In Fig. 12 the instrument is shown as measuring the distance between two holes drilledin a work piece a, the distance between the holes being assumed to be six inches. Theinicrometer sleeve 27 is'adjusted to'the zero mark and the lower end of the screw extension29 is brought to bear against the plate between the two holes. If the dis? tance be-correct, the two holes will appear opposed edges in coinci ence as in the'circle' as one as in the circle Y Fig. 12, but if the distance is too small,1the two holes will appear out of line as inthe circle Z, Fig. 12.

In Fig. 13 the instrument is shown asmeasuring the diameter of a hole drilledin a work piecew. In this illustration as the hole is supposed to be less than an inch, the five inch extension rod 30' is employed with the instrument and the micrometer sleeve 27 is adjusted so as to correspond to the diameter of the hole. If the diameter. of the hole be proper, then in the eye piece of the ner shown inthe circle Y Fig. 13., If however, the hole is not of the proper diameter, then the two circles will be out of coinci: dence as'in the circle Z Fig. 13.

vinstrument, two circles will be visible with I their circumferences intersecting in the manaccuracy may be determined by adjusting f theimicrometersleeve 27 in a proper direction to bring about coincidence by a certain adjusted by an experienced person in the first instanceand is held in this adjusted position This may be effected by supporting the instrument upon a standard 38 havinga'clamp39 atits upper end engaging about'the instrument and a work support 4:0

adjustable on the standard 38 below the instrument. This standard is so adjusted that the work; when placed thereon, will, if

correct in measurement, give coincidence but, I

if incorrect, the coincidence will not be pres-'.

ent. In Fig. 14 the diameter of a round piece of stock-axis measured and gives in thcircle coincidence by the opposed edges of the two images whereas, if the work is too small, separation of theima'ges will take place as in the. circle 2. e

In Fig. 15 the diameter of a work piece In all of the adjustments heretofore described, if the work is not accurate .the in- I I point of the object in both images. How 9 ever, in some instances, the. amount of this is measured from the end thereof and will give coincidence as in the c1rcle y" if the;

' diameter of an inner hole at the center and bottom of the first named bore. The depth ,of the main bore is first taken by scratching a fine line 00 on the bottom of the main bore. The micrometer extension is brought to rest upon any suitable device such'as' a scale m placed, across the top of the bore. The coincidence of the scratched line is then obtained andthe micrometer gives the depth of'the bore plus the thickness of the scale or support. Assuming that the depth of the bore plus the thickness of the scale 'reads 98 hundredths of an inch on a micrometer sleeve, the diameter of the inner center hole as is obtained by adjusting the instrument I until the two edges of the hole are in coincidence as shown in 3 Fig. 17. If the micrometer sleeve :reads one inch plus the scale, then this proves that the difl'erence between the first reading of 98 hundredths of an inch and a second reading, which is one inch, is the correct diameter of'the center hole, namely, two hundredths of an inch. As illustrated in Fig. '17 theinstrument is used with a lower section of the optical rays beyond the crossing point of the axes which of course, is equal to the upper rays. In

other words, the instrument can be raisedor lowered, say for example, 25 thousandths of an inch to bring a piece of stock of 25 thousandths of an inch in diameter into coincidence. The use of the lower optical rays is one of the many features of the lnstrument. 4

While a number of difierent uses of the invention are herein shown and described, it is apparent that many other uses will suggest themselves and it. is not intended by these illustrations to in any-way limit the invention.

From the foregoing it.will be seen that there has been provided an optical instrument with two view openings, the optical axes of which are arranged to intersect the focal point of the instrument to form'two equal angles which are such that a base line connecting said opticalaxes at any distance from either-side of the focal point and at right angles-to the perpendicular of the triangle thus formed, will have a length equal to the per endicular. In this way either the perpen icular or the base may be utilized for measuring purposes.

to secure by Letters atent is: L-An optical instrument of the type defscribed'comprising' two opticalmeans for providing two images of a single obi'ect, the optical axes of .which are relative y fixed and are arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line con-' necting said axes at any distance from either What I claim as m invention and desire side of the focal point and at right angles optical axes of which are relatively fixed and are arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line connecting said axes at any distance from either side of th focal point and at right angles to the perpendicular of a triangle thus formed will have a len h equal to such perendicular, and collecting means for bringlng together the two images of an object located at the focal point. I

3. An optical instrumentof the type de- SCI1bE3d comprising two optical means for providlng two images of a single object, the optical axes of w ich are relatively fixed and are arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line connecting said axes at any distance from either side of the focal point and at right angles to the perpendicular of a triangle thus formed will have a length equal to such perpendicular, collecting means for bringing together two images of an object. located at the focal point, and a telescope associated with said collecting means.

7 4. An. optical "nstrumentof the class-described comprising two optical. means for providing two images of a single'object, the optical axes of which are relatively fixed and are arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line connecting said axes at any distance from the focal point and at right angles to the perpendicular ofthe trianglethus formed will have a length equal to such perpendicular, collecting means for bringing together two images of an object located at the focalpoint, and means for'measuring the amount the images are out of colncidence without changing the fixed relation between the opequal angles which are'such that a base line connecting the axes at any distance from the focal point and at right angles to the perpendicular of the triangle thus formed will have a length equal to such perpendicular, two trapeze prisms associated with such prisms to bring together two images of an object located at the focal point of the 111- strument, and a telescope associated with the trapeze prisms and having its objective provided with an area equal to the surfaces of the trapeze prisms opposed to such objective.

6. An optical instrument of the class described comprisingtwo optical means for providing two images of a single o'bject, sa1d means having their optical axes relatively fixed and arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line connecting the axes at any distance from the focal point and at right angles to the perpendicular of the triangl thus formed Wlll have a length equal to such perpendicular, and two trapeze prisms arranged to bring together two images of an object located at the focal oint of the instrument.

7. An optlcal instrument of the class described comprising two optlcal means for providing two images of a slngle ob ect, said means having their optical axes relatively fixed and arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line connecting the axes at any distance from the focal point and at right angles to the perpendicular of the triangle thus formed Wlll have a length equal to such perpendlcular, two trapeze prisms arranged to bring together two images of an object located at the focal point of the instrument, and a telescope associated with said trapeze prisms and having its objective provided with an area equal to the surfaces of the trapeze prisms opposed to the objective, said telescope having a diaphragm at the focal plane of its eye piece combination to give a circular form to the ocular field. I

' 8. An optical instrument comprising two reflecting prisms, the optical axes of which are relatively fixed and are arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line connecting. the axes at any distance from the focal point and at right angles to the perpendicular of the triangle thus formed will have a length equal to such perpendicular, two trapeze prisms bringing together two images of an object located at the focal point of the instrument, anda telescope arranged so that both images received from the first mentioned prisms are projected by the objective lens to the focal plane of such lens, the area of the objective lens being equal to-those faces bringing together two images of an object. I

located at the focal point of the instrument, and a telescope arranged so that both images received from the prisms are projected by the objective lens to the focal plane of such lens, the area of the objective lens being equal to those faces of the trapeze prism opposed to the objective, and such telescope also having a diaphragm arranged in the focal plane ofits eye piece combination to give a circular form to the ocular .field. 10. An optical instrument of the class described comprising two optical means for providing two images of a single object, the optical axes of which are relatively fixed and are arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line connecting the axes at any distance from the focal point and at right angles to the perpendicular of the triangle thus formed will have a length equal to such perpendicular, collecting means for bringing together two images of an object located at the focal point of the instrument, and meats uring means for measuring'the amount such images are out of coincidence, said measuring means being adjustable in the direction of the perpendicular of the triangle.

11. An optical instrument of the class described comprising two optical means for providing two images of a single object, the optical axes of which are relatively fixed and are arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line connecting the axes at any distance from the focal point and at right angles to the perpendicular of the triangle thus formed will have a length equal to such perpendicular, collecting means for bringing together two images of an object located at the focal point of the instrument, and measuring means for measuring the amount such images are out of coincidence, comprising a portion adapted'for engagement with the object to be measured, and a screw member by which said portion is carried adjustable in the direction of the perpendicular of the triangle.

12. An optical instrument of the class described comprising two optical means for provldmg two images of a single object,

the optical axes of which are relatively fixed and are arranged to intersect at the focal point of the instrument to form two equal angles which are such that a base line con.- necting the axes at any distance from the focal point and at right angles to the perpendicular of the triangle thus formed will. have a length equal to such perpendicular, collecting means for bringing together two images of an object located at the focal point of the instrument, and measuring means for measuring the amount such lmages are out 'of coincidence, said measuring means comprising a screw adjustable in the direction of the perpendicular of the triangle, a clamp connected to said screw, and arod secured in said clamp.

JOSEPH MIHALYI. 

